docs(10_Wiki): W3Schools 위키화 — HTML/CSS/JavaScript(core)
W3Schools 튜토리얼을 P-Reinforce v3.1 포맷으로 위키화(영어 본문, 한/영 섹션 헤더). - Topic_HTML: 59문서 (튜토리얼+예제, 레퍼런스/메타 제외) - Topic_CSS: 190문서 (메인 + Advanced/Flexbox/Grid/RWD 전체) - Topic_JavaScript: 120문서 (코어 언어; Temporal/DOM상세/BOM/WebAPI/AJAX/jQuery/Graphics 등은 후속) 각 폴더 00_INDEX.md(MOC) 포함. 코드 verbatim, 미확인분은 "Not found in source" 표기. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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id: css-border-images
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title: "CSS Border Images"
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category: "Frontend"
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status: "draft"
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verification_status: "conceptual"
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canonical_id: ""
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aliases: ["border-image", "border-image-source", "border-image-slice", "border-image-repeat", "CSS image border", "nine-slice border"]
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duplicate_of: ""
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source_trust_level: "B"
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confidence_score: 0.88
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created_at: 2026-06-23
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updated_at: 2026-06-23
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review_reason: ""
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merge_history: []
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tags: ["css", "web", "frontend", "w3schools", "border-image", "borders"]
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raw_sources: ["https://www.w3schools.com/css/css3_border_images.asp"]
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applied_in: []
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github_commit: ""
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---
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# [[CSS Border Images]]
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## 🎯 한 줄 통찰 (One-line insight)
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The `border-image` property lets you use an image as the border around an element instead of a normal border, slicing the image into nine sections so corners stay fixed while the sides repeat, round, or stretch. [S1]
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## 🧠 핵심 개념 (Core concepts)
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- **`border-image`** — defines an image to be used as the border around an element, instead of the normal border. [S1]
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- **Nine-slice model** — the image is sliced into nine sections (like a tic-tac-toe board); corners are placed at the corners, and the middle sections are repeated or stretched. [S1]
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- **`border` prerequisite** — for `border-image` to work, the element also needs the `border` property set. [S1]
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- **Shorthand** — `border-image` is shorthand for `border-image-source`, `border-image-slice`, `border-image-width`, `border-image-outset`, and `border-image-repeat`. [S1]
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- **Repeat behaviors** — sides can be repeated, rounded, or stretched. [S1]
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## 🧩 추출된 패턴 (Extracted patterns)
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- **Slice-and-place pattern** — slice once, then corners pin while edges tile/stretch to fill any border length. [S1]
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- **Transparent base border pattern** — examples set a transparent `border` (e.g., `10px solid transparent`) so the image border fills space the regular border reserves. [S1]
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- **Slice-value pattern** — the slice value (a unitless number or a percentage like `20%`/`30%`) controls how much of the image becomes corners vs. edges. [S1]
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## 📖 세부 내용 (Details)
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**CSS `border-image` Property**
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The `border-image` property allows you to define an image to be used as the border around an element, instead of the normal border. The image is sliced into nine sections (like a tic-tac-toe board), with the corners placed at the corners and the middle sections repeated or stretched. [S1]
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**Note:** For `border-image` to work, the element also needs the `border` property set! [S1]
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The `border-image` property is a shorthand for the following: [S1]
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- `border-image-source` — defines the path to the image. [S1]
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- `border-image-slice` — defines how to slice the image. [S1]
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- `border-image-width` — defines the width of the image. [S1]
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- `border-image-outset` — defines the amount by which the border image area extends beyond the border box. [S1]
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- `border-image-repeat` — defines whether the image is repeated, rounded, or stretched. [S1]
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Example — image border with `round`: [S1]
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```css
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#borderimg {
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border: 10px solid transparent;
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padding: 15px;
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border-image: url(border.png) 30 round;
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}
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```
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Example — image border with `stretch`: [S1]
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```css
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#borderimg {
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border: 10px solid transparent;
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padding: 15px;
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border-image: url(border.png) 30 stretch;
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}
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```
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Example — different slice values across multiple elements: [S1]
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```css
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#borderimg1 {
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border: 10px solid transparent;
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padding: 15px;
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border-image: url(border.png) 50 round;
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}
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#borderimg2 {
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border: 10px solid transparent;
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padding: 15px;
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border-image: url(border.png) 20% round;
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}
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#borderimg3 {
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border: 10px solid transparent;
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padding: 15px;
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border-image: url(border.png) 30% round;
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}
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```
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**CSS Border Image Properties**
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| Property | Description |
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|----------|-------------|
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| `border-image` | Shorthand for all the border-image-* properties |
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| `border-image-source` | Specifies the path to the image used as a border |
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| `border-image-slice` | Specifies how to slice the border image |
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| `border-image-width` | Specifies the widths of the border image |
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| `border-image-outset` | Specifies the amount by which the border image area extends beyond the border box |
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| `border-image-repeat` | Specifies whether the border image should be repeated, rounded, or stretched |
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[S1]
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## 🛠️ 적용 사례 (Applied in summary)
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The page's own examples are the applied cases: a single image border with `round` and with `stretch`, plus three elements using different slice values (`50`, `20%`, `30%`). No external project/commit applications found in the source.
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## 💻 코드 패턴 (Code patterns)
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Basic image border (language: CSS) — note the required transparent `border`:
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```css
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selector {
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border: 10px solid transparent;
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padding: 15px;
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border-image: url(border.png) 30 round;
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}
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```
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Stretched variant:
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```css
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selector {
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border: 10px solid transparent;
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padding: 15px;
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border-image: url(border.png) 30 stretch;
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}
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```
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## ⚖️ 모순 및 업데이트 (Contradictions & updates)
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No contradictions found in the source.
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## ✅ 검증 상태 및 신뢰도
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- **상태:** draft
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- **검증 단계:** conceptual (실제 적용 사례 발견 시 applied/validated로 승격 가능)
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- **출처 신뢰도:** B (W3Schools — widely used educational reference, not a primary standards body)
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- **신뢰 점수:** 0.88
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- **중복 검사 결과:** 신규 생성 (New discovery)
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## 🔗 지식 그래프 (Knowledge Graph)
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- **상위/루트:** [[CSS Tutorial]]
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- **관련 개념:** [[CSS Rounded Corners]], [[CSS Multiple Backgrounds]], [[CSS Background Size]]
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- **참조 맥락:** Referenced when an element needs a decorative or themed border that a solid color cannot provide.
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## 📚 출처 (Sources)
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- [S1] W3Schools — CSS Border Images — https://www.w3schools.com/css/css3_border_images.asp
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## 📝 변경 이력 (Change history)
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- 2026-06-23: Initial draft synthesized from the W3Schools "CSS Border Images" page (Astra wiki-curation, P-Reinforce v3.1 format).
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